Time delay motor control system



March 1949- H. M. FLEMING 2,463,371

TIME DELAY MOTOR CONTROL SYSTEM Filed NOV. 14, 1945 INVENTORI08111117802149 BY MTA/ESJ" 6. 60 ,Clmtnomrya o I afforrm s Patented Mar.1, 1949 TIIWE DELAY MOTOR CONTROL SYSTEM Howard M. Fleming, West Orange,N. J., assignor to Monroe Calculating Machine Company, Orange, N. J., acorporation of Delaware Application November 14, 1945, Serial No.628,490

3 Claims. (Cl. 318-485) The invention relates to time switches adaptedfor use with motor operated calculating machines, wherein aspring-retracted operating key upon depression operates a switch toclose an electric circuit and start the machine in operation, an objectof the invention being to provide means whereby at the end of apredetermined time following release of said operating key the switchwill be reversely operated to open the electric circuit and stop themachine; or alternatively in the event the operating key is helddepressed for a predetermined unreasonable length of time, the switchwill be reversely operated to open the circuit and stop the machine.Other objects and advantages will appear hereinafter or will be obvious.

The invention consists in the novel construction and combinations ofparts as hereinafter set forth in the claims.

In the accompanying drawings,

Figure l is a side view of the invention as applied, with parts brokenaway, showing the parts in normal position with the switch opened due toadvance of the ratchet wheel from Figure 3 position.

Figure 2 is a view similar to Figure 1, but fragmentary, showing certainof the parts of Figure 1 in the positions assumed upon depression of theoperating key to disengage the latch from the clutch lever and to movethe latch lever out of the path of the lug of the tripping lever tothereby release the detent lever from the ratchet wheel, this being amomentary position of the parts.

Figure 3 is a view similar to Figure 2, with the ratchet wheel restoredby its spring to restore the tripping lever slightly beyond normal, thedetent of teeth, nineteen in the present case, a counting pawl 2 ofknown means for counting the number of cycles engaging said ratchetwheeel to advance it anti-clockwise one tooth for each two cycles, beingdisengaged from said wheel therebetween, and being driven by gearing 2'from the motor 48. A detent lever 3, fulcrumed at 3' to the stationaryframing engages said wheel l to hold its advance, and a coiled spring 4wound around the hub of the wheel and engaging suitable stops 5 of saidwheel and of said framing tends to move the wheel clockwise to restore tto position wherein the counting pawl will engage the first tooth of thewheel.

This counting pawl is mounted eccentrically upon one of the gears 2, andcontacts a guide pin, shown in section in Fig. l, to insure its properoperation, all of which is well known.

Depression of the operating key I38 closes contacts l3 located in anelectric circuit wherein the motor 418 is located and starts the machinein operation as will be explained, said depression also actuating alever M1 and disengaging the latch 48 from the clutch lever I50, therebycausing the latter under influence of its spring l5! to be rocked out ofengagement with a projection 152 of a pawl E53 pivotally mounted uponthe crank arm 55, and causing said pawl under infinance of its spring856 to be rocked into engagement with a driver gear i5? having drivingconnection with said motor. During the above described depression of theoperating key 138, it engages the tail arm of a latch lever B, fulcrumedat 6' to move said latch lever out of the path of 2. lug i of a trippinglever l, fulcrumed also at 3'.

The tripping lever i has spring connection 3" with said framing, and thedetent lever 3 has spring connection 6 with said tripping lever, saidlug 7 having engagement with said latch lever, so that when the latteris moved out of the path of said lug 'l' as aforesaid, the detent leverwill be momentarily released from the ratchet wheel, whereupon thelatter will be restored by its spring 4 to position wherein the countingpawl will engage the first tooth of the wheel from any posi tion ofadvance thereof, and during this restoration a lug 9 of the wheel I willengage an arm of the tripping lever 1 to restore it, at the same timetensioning springs 3" and spring 8, which latter will restore the detentlever. The tripping lever i being so restored will be caught and held bythe latch lever B which has in the meantime been restored by its spring,due to release of the operating key.

During the calculating machine operation, the counting pawl 2 engagesthe ratchet wheel I to advance it, the extent of advancement being suchas to allow the completion of any legitimate operation before saidratchet wheel is advanced sufliciently to operate the switch lever to bedescribed to break the electric circuit and stop the machine.

Thus there will be periodical advance and restoration of the ratchetwheel during successive calculating machine operations.

In the event that a predetermined interval of time should elapsesubsequent to release of the operating key I38 in a calculating machineoperation, the ratchet wheel I will during this time have been advancedto a position wherein the counting pawl will engage between theseventeenth and eighteenth teeth of said wheel, in which position alateral stud Ill of the wheel will engage a cam ll" of and actuate aswitch lever ll, fulcrumed at H" and having an insulated roller l2, toopen the contacts l3 against the tension of the spring thereof and breakthe electric circuit to the motor. After the circuit is broken as statedthe counting pawl 2 will come to rest in position disengaged from theratchet wheel I, due to the coasting of the motor.

Or, in the event the operating key I38 should be held depressed, theratchet wheel I will be similarly advanced, the electric circuit to themotor similarly broken and the machine will be stopped, the reason forthis being that thelatch lever B will remain moved out of the path ofthe lug 1' of the tripping lever, whereas said tripping lever will havebeen restored by the spring 4 and will restore the detent lever 3 intoengagement with the ratchet wheel, the tripping lever so restored havingits lug I caught and held by a second latch lever l4, fulcrumed also at6, the two latch levers having spring connection l5 tending to hold themtogether with the free ends of their overlying arms in contact and latchlever l4 having a spring i6 tending to restore both latch levers.

During the actuation and the restoration of the tripping lever 7, thelug 7' thereof will move between the free ends of the overlying arms ofthe two latch levers, which free ends will be spaced apart to enablesaid lug to enter between them by contact of said lug with the latchlever It just prior to actuation of the tripping lever 1 by its spring 8consequent upon depression of the operating key and actuation of thelatch lever 6.

This contact of the lug I of the tripping lever with the free end of thelatch lever i4 is due to the overlap or extension of the lower face ofthe free end of the latch lever 14 towards lug I and beyond the upperface of free end of the latch lever B.

I claim:

1. A time switch for motor operated calculating machines having anelectric circuit through the motor, a switch in said circuit, cyclicallyoperable registering means, registration control means comprising anoperating key, and means controlling said switch adapted upon operationof said key to close the circuit and to automatically break the circuitand stop the machine at the end of a given time interval comprising aratchet member, means on the ratchet member engaging said switch tobreak the circuit, a spring tending to restore the ratchet member,detent means for the ratchet member, means for releasing the detentmeans upon operation of said key to cause restoration of said ratchetmember by its spring, and a counting pawl driven by the motor andengaging the ratchet member to advance it and tension its spring duringsaid time interval.

2. A time switch for motor operated calculating machines havinganaelectric circuit through the motor, a switch in said circuit,cyclically operable registering means, registration control meanscomprising an operating key, and means controlling said switch adaptedupon operation of said key to close the circuit and to automaticallybreak the circuit and stop the machine at the end of a given timeinterval comprising a ratchet member, means on the ratchet memberengaging said switch to break the circuit, a spring tending to restorethe ratchet member, detent means for the ratchet member, a latch for thedetent means, said key in its operation engaging said latch to releaseit to momentarily release said detent means and cause restoration ofsaid ratchet member by its spring, and a counting pawl driven by themotor and engaging said ratchet member to advance it and tension itsspring during said time interval.

3. A time switch for motor operated calculating machines having anelectric circuit through the motor, a switch in said circuit, cyclicallyoperable registering means, registration control means comprising anoperating key, and means controlling said switch adapted upon operationof said key to close the circuit and to automatically break the circuitand stop the machine at the end of a given time interval comprising aratchet wheel, means on the ratchet wheel engaging said switch to breakthe circuit, a spring tending to restore the ratchet wheel, a trippinglever having a spring connection with the stationary framing, a detentlever engaging said ratchet wheel and having spring connection with saidtripping lever, a latch lever engaging said tripping lever and havingspring connection with said framing, said key in its operation engagingsaid latch lever to release it to momentarily release said trippinglever and said detent lever and permit restoration of said wheel by itsspring, a second latch lever having spring connection with said framing,the two latch levers having spring connection with each other tending tohold them together, said second latch lever engaging said tripping leversubsequently to its restoration in the event said key is held ineffective position during said given time interval, and a counting pawldriven by the motor and engaging said ratchet wheel to advance it andtension its spring during said time interval.

HOWARD M. FLEMING.

I file of this patent:

UNITED STATES PATENTS

